从 repo 清除结帐/克隆后，我在执行 jaxb2-maven-plugin xjc 目标时在 eclipse 中收到此错误。在“更新 Maven 配置”之后，代码仍然没有生成。在我的 neon3 eclipse(4.6.3) 中，我已经安装了 m2e 插件(1.7.1) 以及“用于 jaxb2 的 m2e 连接器”(4.0.0)
null (org.codehaus.mojo:jaxb2-maven-plugin:2.2:xjc:xjc-evu:generate-sources)
org.apache.maven.plugin.MojoExecutionException
at org.codehaus.mojo.jaxb2.javageneration.AbstractJavaGeneratorMojo.performExecution(AbstractJavaGeneratorMojo.java:482)
at org.codehaus.mojo.jaxb2.AbstractJaxbMojo.execute(AbstractJaxbMojo.java:257)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
at org.eclipse.m2e.core.internal.embedder.MavenImpl.execute(MavenImpl.java:331)
at org.eclipse.m2e.core.internal.embedder.MavenImpl$11.call(MavenImpl.java:1362)
at org.eclipse.m2e.core.internal.embedder.MavenImpl$11.call(MavenImpl.java:1)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:176)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:112)
at org.eclipse.m2e.core.internal.embedder.MavenImpl.execute(MavenImpl.java:1360)
at org.eclipse.m2e.core.project.configurator.MojoExecutionBuildParticipant.build(MojoExecutionBuildParticipant.java:52)
at org.eclipse.m2e.core.internal.builder.MavenBuilderImpl.build(MavenBuilderImpl.java:137)
at org.eclipse.m2e.core.internal.builder.MavenBuilder$1.method(MavenBuilder.java:172)
at org.eclipse.m2e.core.internal.builder.MavenBuilder$1.method(MavenBuilder.java:1)
at org.eclipse.m2e.core.internal.builder.MavenBuilder$BuildMethod$1$1.call(MavenBuilder.java:115)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:176)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:112)
at org.eclipse.m2e.core.internal.builder.MavenBuilder$BuildMethod$1.call(MavenBuilder.java:105)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:176)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:151)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:99)
at org.eclipse.m2e.core.internal.builder.MavenBuilder$BuildMethod.execute(MavenBuilder.java:86)
at org.eclipse.m2e.core.internal.builder.MavenBuilder.build(MavenBuilder.java:200)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:735)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:206)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:246)
at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:301)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:304)
at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:360)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:383)
at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:144)
at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:235)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
Caused by: java.lang.NullPointerException
at org.codehaus.mojo.jaxb2.shared.environment.ToolExecutionEnvironment.restore(ToolExecutionEnvironment.java:182)
at org.codehaus.mojo.jaxb2.javageneration.AbstractJavaGeneratorMojo.performExecution(AbstractJavaGeneratorMojo.java:427)
... 33 more
在同一个 pom.xml 中，它在生命周期映射下标记为
<action>
<execute>
<runOnIncremental>false</runOnIncremental>
<runOnConfiguration>true</runOnConfiguration>
</execute>
</action>
这里表示位串连接器应该支持 jaxb2-maven-plugin，在作者的这篇评论中，我可以看到自版本 1.0.3.201107311209 以来就有支持。尽管如此，在作者主页上还是说明了
插件：org.codehaus.mojo:jaxb2-maven-plugin
http://mojo.codehaus.org/jaxb2-maven-plugin
（注意：jaxb2-maven-plugin 1.5+ 版不需要）
我应该使用哪个 m2e 连接器或 pom.xml 配置来使 jaxb2-maven-plugin 在 eclipse 中工作（意思是，它将在更新配置的 generate-sources 阶段生成 surces 并将生成的文件夹添加到类路径中）？